Widely used as a catalyst in organic synthesis, especially in Friedel-Crafts reactions, where it helps form carbon-carbon bonds for producing aromatic compounds, dyes, pharmaceuticals, and fragrances. It plays a key role in the production of anthraquinone and styrene. Also employed in petroleum refining to promote alkylation processes that improve fuel quality. In small-scale applications, it serves as a reagent in laboratories for chlorination and dehydration reactions. Additionally, it is used in antiperspirants due to its ability to temporarily block sweat ducts, though this use is limited compared to other aluminum compounds. Its strong affinity for chloride ions makes it useful in metallurgical processes and wastewater treatment for removing impurities.